Data/hora: 26/09/2024 10:25:47

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	24/10/2000	
Data da última atualização: 	24/10/2000	
Autoria: 	FOIL, L. D.; BARROS, A. T. M.	
Afiliação: 	Louisiana State University. Dept. of Entomology (Baton Rouge, LA); Embrapa Pantanal (Corumba, MS).	
Título: 	The effects of management strategies on resistance in the horn fly, Haematobia irritans.	
Ano de publicação: 	2000	
Fonte/Imprenta: 	In: INTERNATIONAL CONGRESS OF ENTOMOLOGY, 21.; BRAZILIAN CONGRESS OF ENTOMOLOGY, 18., 2000, Foz do Iguassu. Abstracts... Londrina: Embrapa Soja, 2000. v.2, p.761.	
Idioma: 	Português	
Conteúdo: 	The effect of different management strategies on insecticide resistance in horn fly populations was evaluated. Weekly fly counts were conducted to evaluate control efficacy of the treatments, and bioassays were conducted at least twice per year to measure fly susceptibility to organophosphates (OP's) and pyrethroid insecticides. Flies studies demonstrated that use of a single class of insecticidal ear tag during the horn fly season resulted in product failure within three to four years for pyrethroids and OP's, respectively. At one site, ear tags impregnated with OP's were used yearly for 10 years; and in a four year period, the efficacy of 20% diazinon-impregnated ear tags was reduced from > 20 to just 1 week  of control. Subsequently, mid-summer treatment with ivermectin pour-on apparently reversed resistance to OP's during the following fly season on two different occasions. The yearly alternated use of synergized pyrethroid (lamda-cyhalothrin + piperonyl butoxide) and organophosphate (pirimiphos-methul) ear tags was evaluated for control of two pyrethroid-resistant horn fly populations in Lousiana over a seven year period. Control achieved by synergized pyrethroid ear tag treatments was reduced from seven to two weeks and from four to zero weeks at St. Joseph and Winnsboro, respectively. Control by organophosphate ear tags decreased from fifteen to three weeks and from ten to seven weeks at St. Joseph and Winnsboro, respectively. The yearly rotation of synergized lambda-cyhalothrin and pirimiphos-methyl ear tags did not improve pyrethroid ear tag efficacy or prevent further development of resistance to the pyrethroid or OP compounds. However, a two-year use of organophosphates resulted in partial reversion of pyrethroid resistance. When pyrethroid and organophosphate ear tags were used in a mosaic strategy at two different locations, efficacy of products did not change during a three-year period.	
Palavras-Chave: 	Control; Controle; Flies; Insect; Management; Mosca-dos-chifres.	
Thesagro: 	Entomologia; Haematobia Irritans; Inseto; Manejo.	
Thesaurus Nal: 	entomology; livestock.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (46416-1) - UPC - PL - -- - 632.7 - I61a - 2000.00199 - DIS